Liquefied natural gas (LNG) technology - equipment design Cryogenic valves valve is mainly used in - at low temperature 40 ~ - 273 ℃ low temperature fields, mainly including low temperature ball Industrial Valves, gate valve, globe valve at low temperature, low temperature at low temperature relief valve, check valve, butterfly valve at low temperature, low temperature at low temperature of the needle valve, throttle valve at low temperature, low temperature pressure reducing valve, etc, is mainly used for liquefied natural gas ( LNG） , liquefied petroleum gas ( LPG） , air liquefaction and separation, aerospace, and other areas of the low temperature. Output of the cryogenic liquid medium, such as LPG, LNG, liquid oxygen, liquid nitrogen, liquid hydrogen, etc. , is flammable and explosive and easy too critical pressure under low temperature condition, etc. LNG cryogenic valve is mainly used in - 162 ℃ of liquefied natural gas (LNG) domain, generally using 9 Ni steel manufacturing, or containing Ni stainless steel manufacturing, to ensure that the low temperature condition material has enough ability to resist low temperature cold stress. Cryogenic valves due to factors such as unqualified material, easy to cause shell and sealing surface cracking, the comprehensive mechanical properties, strength and stiffness, great changes have taken place under low temperature conditions can easily lead to an explosion caused by leakage of liquefied natural gas (LNG) medium. Therefore, in the process of research and development of LNG valve, need to consider the material, the critical storage, export LNG blind area, extreme problems such as heat bilges cold shrink. LNG cryogenic valves pressure rating shall generally be 150 lb, 300 lb, 600 lb, 900 lb, 1500 lb ( 45 mpa) size, generally between 15 to 1200 mm, mainly USES the flange connection form and welded, the valve material generally choose the CF8, generally between 40 ~ - operating temperature Between 162 ℃ and main driving mode are manual, pneumatic, etc.

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